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Investment securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | $ 185,695 | $ 63,074
Unrealized Loss, Less than 12 months | (824) | (394)
Fair Value, 12 months or more | 0 | 175,730
Unrealized Loss, 12 months or more | 0 | (1,497)
Fair Value, Total | 185,695 | 238,804
Unrealized Loss, Total | (824) | (1,891)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 0 |
Unrealized Loss, Less than 12 months | 0 |
Fair Value, 12 months or more | 0 |
Unrealized Loss, 12 months or more | 0 |
Fair Value, Total | 0 |
Unrealized Loss, Total | 0 |
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 182,012 | 47,641
Unrealized Loss, Less than 12 months | (803) | (164)
Fair Value, 12 months or more | 0 | 175,730
Unrealized Loss, 12 months or more | 0 | (1,497)
Fair Value, Total | 182,012 | 223,371
Unrealized Loss, Total | (803) | (1,661)
States and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 3,184 | 15,433
Unrealized Loss, Less than 12 months | (20) | (230)
Fair Value, 12 months or more | 0 | 0
Unrealized Loss, 12 months or more | 0 | 0
Fair Value, Total | 3,184 | 15,433
Unrealized Loss, Total | (20) | $ (230)
Corporate securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 499 |
Unrealized Loss, Less than 12 months | (1) |
Fair Value, 12 months or more | 0 |
Unrealized Loss, 12 months or more | 0 |
Fair Value, Total | 499 |
Unrealized Loss, Total | $ (1) |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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